我相信他会在向上司投诉他遇到困难的时候生闷气的。

I believe he's sulking in some corner composing a complaint to his superiors.

youdao

树是一个好地方，你想生闷气的时候藏进去，没有人能找到你。

A tree is a place to hide when you want to sulk, where they can't.

youdao

快到中午的时候，一个女售货员听见从一堵墙里传出一种闷声闷气的叫声。

Towards midday, a girl heard a muffed cry coming from behind on of the walls.

youdao